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How Chinese Multiply

Discussion in 'BBS Hangout' started by heypartner, Dec 6, 2014.

  1. heypartner

    heypartner Contributing Member

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    Like this:
    <img src="http://politicata.files.wordpress.com/2012/11/no-condoms-ever.png" height=100>

    and this,
    and this is far more instructive and useful

    <iframe width="420" height="315" src="//www.youtube.com/embed/SO-qULaAwMY" frameborder="0" allowfullscreen></iframe>
     
    1 person likes this.
  2. Moleb

    Moleb Member

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    if schools taught this, we would defiantly exercise a different part of our brain. I wouldn't mind seeing both methods taught. At least up until middle school.
     
  3. AFS

    AFS Member

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    I think I learned this method in middle school. Forgot it existed until now though.
     
  4. Bandwagoner

    Bandwagoner Contributing Member

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    if the title of a youtube vid says something it must be true amirite?
     
  5. RV6

    RV6 Contributing Member

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    Not impressed

    [​IMG]
     
  6. heypartner

    heypartner Contributing Member

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    ^ wait. Fitzpatrick named his son after Tom Brady? Or worse, his wife named him Brady
     
  7. Blurr#7

    Blurr#7 Contributing Member

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    Michael J Fox finds this useless.
    *side note* I thought this was gonna be a thread about overpopulation in China
     
  8. DudeWah

    DudeWah Member

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    Chinese methods in math are very different from our own. I've noticed this a lot of times. Here's an example:

    In calculus, you often solve for the area under a curve. The way they teach it in America is you have to first identify which function is on top and which is below it. Then you integrate the difference of those two. That is often tedious and cumbersome because it takes an extra (unnecessary) step.

    The Chinese way, you just integrate the difference of one curve minus the other, with no regards to the positioning on either. Then you just take the absolute value. So much time is saved by doing this.

    You can actually apply this to finding the volume of two solids using multiple methods as well. No need to worry which curve is above or below. Just subtract and take the absolute value after integrating.
     
  9. dmc89

    dmc89 Member

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    Strange. That's how we were taught in college.
     
  10. Bandwagoner

    Bandwagoner Contributing Member

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    lower cal classes teach the first way for practice.
     
  11. Steve_Francis_rules

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    The method used in the video doesn't seem any faster than the method typically taught in American schools, but's it's probably easier. However, it's not immediately obvious to me why it works.
     
  12. heypartner

    heypartner Contributing Member

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    That's just a demonstration. That method looks easier to me doing it in your mind (or your fingers). Seems much easier to do in your mind that way vs ours.

    As Moleb said above, just requires practicing math visualization with a different part of the brain, maybe.
     
  13. Jontro

    Jontro Member

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    Is that kind of multiplication sanctioned by the Chinese gov't though?
     
  14. RedRedemption

    RedRedemption Contributing Member

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    And then you realize calculators can do this in less than a millisecond. :D
     
  15. heypartner

    heypartner Contributing Member

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    Btw how many people here know how to use the black box known as a slide rule. Not me

    I had a chemistry teacher is HS who had a six foot long slide rule above his blackboard. It was stunning to watch him use it. During tests he said we could use calculators if every student had one, but he said anyone could use a slide rule if you got em
     
  16. TheMystery008

    TheMystery008 Member

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    Then people become too reliant on them and fail a class that won't let you use a calculator.
     
  17. Jontro

    Jontro Member

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    Remember those calculator watches in middle school back in the day? They were very helpful.
     
  18. Buck Turgidson

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    I've never had a job that wouldn't let me use a calculator.
     
  19. bigtexxx

    bigtexxx Contributing Member

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    Still doesn't explain why China is so poor
     
  20. what

    what Member

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    U,,,, but I thought math was the universal language. Somebody lied!
     

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